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Roman Numerals
What are Roman Numerals?
Roman Numerals are used to express numbers using capital letters. Here are the 7 letters used.
• I-1
• V-5
• X-10
• L-50
• C-100
• D-500
• M-1000
How do Roman Numerals Work?
*Values greater than or equal to the number to there right are simply added on.
 III=(1)+(1)+(1) IX=(10)+(1)+(1) Note: It is never necessary to place more than 3 identical capital letter next to one another. When writing Roman Numerals, it is possible to write 4 as IIII. However, because there are 4 identical capital letters, it is both easier and more appropriate to write 4 as IV. Here is how it works.

*Values smaller than the number to there right are subtracted from that (larger) number.
 IV=(5)-(1) IX=(10)-(1) IV includes the Roman numeral symbols of (1) and (5). However, because there is an I before the V it is subtracted. 5-1=4. Likewise with IX, an I (1) is to the left of the X (10), therefore it is subtracted to equal 9.

Roman Numerals 1-10:

 I II III IV VI VII VIII IX X

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Last Update: 12/4/2004

Dan Cook
© 2004 DEC Stuff